The ornamental design for a lapelpin, as substantially shown and described.
FIG. 1 is a perspective view of a lapel pin showing my new design;
FIG. 2 is a front side elevation view thereof;
FIG. 3 is a back side elevation view thereof;
FIG. 4 is a left side elevation view thereof, the right side elevation view being a mirror image thereof;
FIG. 5 is a top plan view thereof; and,
FIG. 6 is a bottom plan view thereof.
The broken line showing of the upper portion and rear pin structure of the lapel pin is included for the purposes of illustrating environment and forms no part of the claimed design.